diff --git a/makegraph.sh b/makegraph.sh
index 66c091d..943cda8 100755
--- a/makegraph.sh
+++ b/makegraph.sh
@@ -7,3 +7,11 @@ if which dot 2>&1 > /dev/null ; then
 else
 	echo 'You need to install graphviz first'
 fi
+
+if [ "$1" != 'noopt' ]; then
+	if which optipng 2>&1 > /dev/null ; then
+		optipng -o7 -zm9 -v nodes.png
+	else
+		echo 'optipng is not present, not optimizing compression'
+	fi
+fi